Following are a number of back-translations as well as a sample translation for translators of Jeremiah 9:6:

• Kupsabiny: “(They) have learnt to speak lies,
  and they completely refuse to honor me.
  It is I God who is speaking.’” (Source: Kupsabiny Back Translation)
• Hiligaynon: “All they do is deception, and their being-deceitful they no longer acknowledge me.” (Source: Hiligaynon Back Translation)
• English: “They habitually lie and deceive each other,
  and no one will admit/say that I am God.” (Source: Translation for Translators)